XArray-class: Virtual array of general R objects
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XArray-class

R Documentation

Virtual array of general R objects

Description

Template for construction of virtual arrays ('VirtualArray') and a derived class ('XArray') to instantiate it with general objects.

Arguments

`stack`	A `list`-class object.
`index`	A `vector`, `matrix` or `array` type object. Includes the indices of layers in the stack.
`dim`	A `numeric` vector. Same as for `array`, creates `proxy` procedurally.

Details

The 'VirtualArray' class implements structures to organize objects of the same class in multidimensional arrays. Subsetting rules were defined using the proxy object in the index slot. The 'VirtualArray' is the base class for 'XArray' and 'RasterArray' classes. The 'XArray' class derived from VirtualArray allows the instantiation of basic virtual arrays with genearl R objects, which form a single list in the @stack slot. The 'SfArray' class is derived from the 'XArray' class.

The class has two slots: @stack: A list containing objects of the same class (i.e. layers). @index: A proxy object that represents the structure of the entities.

Value

An XArray-class object.

Examples

# 2d XArray of vectors
  data(exemplar)
  st <-exemplar@stack
  ind <- 1:nlayers(st)
  dim(ind) <- c(3,4)
  dimnames(ind) <- list(n = c(10, 20, 30), seed = 1:4)
  xa<- XArray(stack=st, index=ind)

via documentation built on May 31, 2023, 8:31 p.m.